The OpenJPEG library was designed to be an open-source JPEG 2000 codec written in C language. It has been developed in order to promote the use of JPEG 2000, the new still-image compression standard from the Joint Photographic Experts Group (JPEG). In addition to the basic codec, various other features are under development, among them the JP2 and MJ2 (Motion JPEG 2000) file formats, an indexing tool useful for the JPIP protocol, JPWL-tools for error-resilience, a Java-viewer for j2k-images, …
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OpenJPEG is a small, free, lossy and high quality JPEG 2000 codec, licensed under the GNU GPLv2 license. It is a free and open source library under the GNU GPL V2 license. It is designed to be extensible (using plugins) to any kind of image codec. It provides two basic APIs: The library (OpenJPEG) is Open Source Software (OSSL), and there are many developers, contributors and sponsors. Documentation and Tools: The OpenJPEG library documentation is freely available. The library documentation is also used to help documenting the JPEG 2000 standards of the Joint Photographic Experts Group (JPEG). The OpenJPEG library documentation includes the following sections: User’s Guide: The information guide about how to use the library in your applications. API and Plugins: The information guide about the API and plugins of the library. FAQ: The help that you can get with questions about the use of the library. License and Credits: The information guide about how to use the library, which would give you the GNU GPL V2 license. Readme and Installation: The document describing how to set up the library for use. Web Site: The official website where you can find the documentation, the source code, the development information, the releases and the credits of the library. Programming Documentation: The programming documentation is available in HTML format, you can download it as follows: Acknowledgements Many thanks to all of the following people: Jakob Horn David Giger (dgiger) Greg Roelofs Alexandre Moret Simon Fischer Marc-Andre Mouton Abelson Robert Okamoto David Johns Bohdan Stefanski Pete Kohlmorgen Stephen Mifflin Brad Neuberg Mathias Krause Christoffer Inge Helland Matt Giusto Tomas Lopez Aguero Michal Palek Vladimir Romov Ruediger Trautz Antoine Besnard Guillaume Martens Guy Ellis Phil Jintz Marty Wilcox Matej Seger Guilherme Nabuco Ken Wh
The OpenJPEG library provides a high-quality, free, open-source library for lossy and lossless JPEG 2000 and Motion JPEG 2000 image compression. It is based on the JPEG 2000 standard as described in “JPEG 2000 Image Compression”, ISO/IEC IS 15444-1, 2002, and the JPEGBench – It was developed specifically for Windows. The library can be used for both Windows and Linux operating systems. The OpenJPEG library implements the entire JPEG 2000 compression/decompression specification, including decoding of all of the syntax variants defined by the JPEG 2000 standard. The library also implements all of the Motion JPEG 2000 compression/decompression functions. The codec uses a 32-bit version number and the same version number is also used for the library files. The library is compact, requiring only about 33 KB of executable code and only 3 KB of library code. It works on most 32- and 64-bit PCs, laptops and 32- and 64-bit Windows mobile devices. The library was developed with the use of visual Studio or Dev-C++ Compiler. Versioning and testing: OpenJPEG maintains the version numbering of libjpeg-8 and all changes are simply renumbering of the subsequent version numbers. OpenJPEG uses the same version numbers as the j2k-tools. Releases: Each release of the library contains a tag which is a monotonically increasing version number. The first release was OpenJPEG 0.8, dated 26 August, 2004. The first revisions to the code were made available to the public in March 2005. The current version is 8.0, dated 29 August, 2008. Licensing: OpenJPEG is released with a BSD licence. For developers, non-commercial use is granted. The library is available at the MANDROME-projects web site. For educational institutions (Universities and Institutes) the library is available directly via the MANDROME Institute. For commercial organisations the library is available via the MANDROME-Projects web site. The MANDROME Institute is now closed due to lack of funding. The library will continue to be made available via the MANDROME-Projects web site. Terms: The MANDROME-Projects web site is available under b7e8fdf5c8
The JPEG2000 plugin is licensed under the BSD License. This means that you are free to copy, modify and/or distribute the source code. Source is available in its own subdirectory. Download and Build the Plugin The source code distribution includes pre-compiled plugins for MS Visual Studio, Linux and Windows. If you are using the source build, you need to build the source, copy the plugin in the directory where are your plug-ins (and j2k-plugins if you have them installed), and then, in the directory where you put the Java class (plugin), run: javac /plugin/org/openjpeg/j2k/j2k.java This will create the jar file needed to use the plugin. If you are using the binary build, you just need to copy the plugin in the directory where are your plug-ins (and j2k-plugins if you have them installed), and then use one of the built-in uploader (browse the file system, a web browser, command line,…) Note: On Linux, the binaries are just made for x86 and NOT for AMD64. This is because the j2k-jni lib is not compiled for 64 bits… The plugin uses Java reflection in order to perform several j2k-related operations. The reason for this is that Java is not a compiled language, therefore, we need a Java runtime to be able to use this library. In addition, the plugin does not support pure Java (which is easily achieved using tools such as scalac), because of the amount of code generated by the j2k-jni lib. However, this also means that we are free to use any alternative java code generation tool that supports the lib. Using the Plugin in Web Applications If you have a j2k-image, you can use this plugin to decode it. The plugin adds a little HTTP header to tell the server that the image is in j2k format. You can put it in a PHP, C#, C++, or Java web page with the following code: To make the plugin to automatically remove it, use this HTML code: To use the plugin as an image file, you need to rename it to j2k.html
OpenJPEG is an image codec library written in C language. This project has been started in order to promote JPEG2000 as a new still-image compression standard. JPEG2000 is based on wavelet transforms, which are better than discrete cosine transforms (DCT) for many still-image compression tasks. The codec is designed for both single images and sequences of multiple images. It uses a tree-based algorithm for entropy coding, and thus is as fast as CCITT Group 4 and Group 5 compression codecs. While these codecs produce somewhat larger files than those of a lossless compression algorithm, the additional bytes are small enough to allow storage and transmission over a wide variety of connections at reasonable speed. Currently only lossy compression is supported. This is likely to change in the future. The library can be used as a component in other software, or the library can be used to build an image codec. An open-source version is available. The supplied code is covered by the GNU LGPL and you are free to use the code in any way you want, without any obligations. OpenJPEG is not the only JPEG2000 codec available; see JPEG2000 New Media Interoperability. The open-source image file library jpeg2000 is free software licensed under the GNU General Public License. Jpeglib is an optional library that wraps the jpeg-io routines in the API from jpeg-2000. Jpeg-io routines are useful for manipulating and inspecting JPEG 2000 images. Jpeg2000-IO is a replacement set of APIs to the jpeg-io tools and the jpeg-io utilities. Since jpeg-io is a library, it is not an open-source project. The following is a list of other projects that implement JPEG 2000: JPip is a test suite and set of tools to evaluate and benchmark JPEG 2000 coders. To use it you will need a capable image viewer (like Adobe Acrobat viewer). Here is an example how to start using it: You should choose a suitable input image, open the file, and then run the following command: jpeg2k -r -q -j 2 -j 0 -b *.exr where *.exr is the name of the input image file. It generates a JPIP formatted testfile.jpt, and also runs with Python (see below). For example
The mobile device must have a screen with a resolution of 1280 x 720 pixels or better. A web browser with Java 5 or later must be installed on your phone. A web browser with Javascript enabled must be installed on your computer. It is recommended that you are using Internet Explorer 6 or later and Chrome or Safari for your web browser. Some browsers such as Dolphin browser does not support WebGL, please refer to the following post in the Dolphin forum for support:
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